docs: def add_prefix(self, name, *args, **kwargs):
          """
          Adds a new prefix to the workdir.
  
          Args:
              name(str): Name of the new prefix to add
              *args: args to pass along to the prefix constructor
              *kwargs: kwargs to pass along to the prefix constructor
  
          Returns:
              The newly created prefix
  
          Raises:
              LagoPrefixAlreadyExistsError: if prefix name already exists in the
              workdir
          """
          if os.path.exists(self.join(name)):
              raise LagoPrefixAlreadyExistsError(name, self.path)
  
          self.prefixes[name] = self.prefix_class(
              self.join(name), *args, **kwargs
          )
          self.prefixes[name].initialize()
          if self.current is None:
              self.set_current(name)
  
          return self.prefixes[name]